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Won't charge no light on MagSafe 2

I replaced the top half (keyboard, trackpad, battery, and top case) due to keyboard problems (the customer had dropped it, and it would not boot up) I also changed the SSD due to it being dead. Everything came up with a new OS load (Big Sur) and was charging (lights working on MagSafe 2) with no issues.

I let it charge overnight all was working great with no issues, gave it back to the customer and a few days later he said that it was having charging issues where the light would come on and then go out and not come back on

I took it back and swapped out the charger with a known good one and got the same problem, no lights (I even plugged his charger in my old MacBook Pro 16" late 2013 and it works). Reset SMC no change. Replaced the DC-in power board still no change.

Replaced the battery still no change. Ran Apple Diags get PPP002 and PPP007 errors, which points to the power adapter (no charging lights)

I’m running out of ideas to try.

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Sadly the logic board charging logic has a problem. There is two pieces here the switching logic which is a set of MOSFETs, and there is the charging control logic which is a voltage comparator working with the SMC micro-controller.

You’ll need to take the logic board out to inspect the backside around the Yellow marked chip (review the MacBook Pro 13“（2013年底版）视网膜显示屏拆卸)

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Look for signs of liquid spillage or corrosion. See if cleaning and touching up the solder joints bring it back.

Otherwise you’ll need to trace out the logic with a DVM and a good bench power supply, referencing the schematics an board-view drawings.

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hello Richard,

this is a fairly simple power circuit fault. Unfortunately for you (or maybe the opposite), the time of "replace batteries" type of faults is over. Time to move deeper :-)

your job is to check the voltages going into the transistors, make sure they create the required voltages, and allow them to be further processed by the passives and other ICs. Such a job. Finf out the schematic for this motherboard and analyze the power supply model. The next step will be to transfer this knowladge to the motherboard and confirm the operation of the components. A little hint: it seems to me that the problem lies at the beginning, but you should ask the owner what is the last thing he remembers from the life of this computer. I guess that's it, good luck. Fingers crossed.

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Richard Macbeth 将永远感激不已
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